Re: Comparing images [WAS: Re: Comparing pictures]

> If they need to be identical it's not a problem
Yes, this is a problem, because I don't know how to get graphic area and 
picture from the content of a listbox cell!

But it doesn't matter, I think the best way is to add a hidden column or 
subclass the ListBox class, as previously suggested.

Thanks a lot.

Jean-Luc Arnaud

Le 19/03/2018 à 17:18, Eduardo Gutierrez de O a écrit :
> Understood.
>
> I wasn't sure what you meant by "comparing". If they need to be identical it's not a problem but I thought it might mean finding the closest similarity.
>
> For the latter I've used perceptual hashes (p-hashes) in the past with good results. They're also acceptably fast (I do ther comparison in images of several megapixels originally). They allow you to get a "score" of similarity and a confidence value, which helps taking decisions. The hash is text, so it's not memory intensive either.
>
> Eduo
>
>> On 19 Mar 2018, at 10:39, Jean-Luc Arnaud <jean-luc-E/[email protected]> wrote:
>>
>>> you mean actually comparing the images themselves?
>> Yes, indeed. But they are only icons, 32x32 or 16x16 pixels, so comparing pixel to pixel should be fast.
>>
>> Jean-Luc Arnaud
>>
>> Le 17/03/2018 à 12:39, Eduardo Gutierrez de O a écrit :
>>> Hi, Jean-Luc
>>>
>>> This is not what you're asking, but I'm intrigued.
>>>
>>> When you say you're comparing pictures you mean actually comparing the images themselves? If so, are you using some sort of p-hash or the images are identical?
>>>
>>> Eduo
>>>
>>>> On 16 Mar 2018, at 17:42, Jean-Luc Arnaud <jean-luc-E/[email protected]> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> I'm used to drawing icons in Listbox cells.
>>>>
>>>> I need to compare these icons with pictures, in order to determine what action should fire when clicked.
>>>>
>>>> I know coordinates of each icon in the cell.
>>>>
>>>> 1) Is the RGBSurface and Pixel comparison a good way?
>>>>
>>>> 2) How to get an RGBSurface of a cell area in the CellClick event? I can't figure out how to get a Graphics object of the area and then a RGBSurface.
>>>>
>>>> All suggestion welcome, including MBS plugins use.
>>>>
>>>> TIA for your help.
>>>>
>>>> -- 
>>>> Jean-Luc Arnaud
>>>>